geom_step.py 文件源码

def draw_group(data, panel_params, coord, ax, **params):
        n = len(data)
        data = data.sort_values('x', kind='mergesort')

        # create stepped path -- interleave x with
        # itself and y with itself
        xs = np.repeat(range(n), 2)[:-1]
        ys = np.repeat(range(0, n), 2)[1:]

        # horizontal first
        if params['direction'] == 'hv':
            xs, ys = ys, xs

        df = pd.DataFrame({'x': data['x'].values[xs],
                           'y': data['y'].values[ys]})
        copy_missing_columns(df, data)
        geom_path.draw_group(df, panel_params, coord, ax, **params)